// ADD TO api.php
case 'get_auto_dtc_rules':
    $file = __DIR__ . '/data/auto_dtc_rules.json';
    if(!file_exists($file)){
        echo json_encode(['success'=>true,'rules'=>[]]);
        exit;
    }
    $rules = json_decode(file_get_contents($file), true);
    echo json_encode(['success'=>true,'rules'=>$rules]);
    exit;
